Why is the First LIVE Electrical Test so Important..
In the video UK electrician Marcus is carrying out the first live test according to BS7671 re-check supply polarity. Using an approved voltage indicator conforming to GS38 Marcus identifies a problem. On investigation the issue is in the cable supplying the consumers unit. Once the fault is corrected the supply polarity is checked again and confirmed before carrying out further live tests.
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== 🕐 Time Stamps - Cut to the action 🕕 ==
00:00 - Re-check supply polarity
00:10 - First live test
01:00 - Fuse in the neutral
01:24 - Neutral and earth bar 234 volts AC
01:41 - Industrial plug
02:22 - Re-checking supply polarity
Videos are training aids for City and Guilds (C and G) and EAL courses Level 1, 2, 3 plus AM2, AM2S and AM2E.
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Excellent work Marcus , so many spark neglect to check the supply polarity . And then wonder why they get a shock or worse dead . It it important to carry out all the test and in the correct order, if in doubt leave it alone. Fantastic video Marcus as always 👍
Great demo marcus.
Thanks sir 🦾
Great video. This is such an important testing procedure that is not always carried out.
Thank you!
Thanks.
Many many years ago a electrician on site connected a house up but with the reverse L-N like here so the protective device was in the neutral but he didn't test the installation and the lighting circuit had a L-E fault so the fault didn't clear and the first leg of the 1.0mm lighting circuit all melted .
Thanks for your professional input 👍🏻
Would that be a C1?
yes
So why would the socket wired backwards affect the entire board?
The socket was feeding the board and the socket had incorrect polarity. Thanks for commenting 👍🏻 Gaz
@@GSHElectrical Ah didn't realise the socket was feeding the board, thought the board was feeding the socket. Thanks for the info
O heck very dangerous. Only came across that three times in my career
C1
Wow yeah could see that been extremely dangerous
🦾
The polarity reverses twice every cycle. 100 polarity changes every second.
Polarity means that the line and the neutral are the right way round, neutral definitely shouldn't have 230V on it.
@@zacgibbons1208 sine wave + and -
@@UnimportantAcc For the voltage in the line conductor, nothing to do with polarity in an electrical installation
An alternating current and voltage is not the same as polarity sausage... TN installations might get a bit exciting otherwise...
Technically you are correct, and the proper term ought to be polarisation, but polarity is what the electrical trade use for AC installations so we are rather stuck with it. Electricians aren't physicists.